The Dodgers had already given up on Guerra 10 days ago, when he was designated for assignment, and had hoped to trade him. When that didn't happen, the club tried to get the former closer through waivers so it could outright him to the Minor Leagues.
Rosin's situation was more complicated. To outright him to the Minor Leagues, Rosin needed to clear waivers, then be offered back to the Phillies, who lost him in the Rule 5 Draft.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.